House rolled over onto his back, and looked up at the ceiling. "Okay, let me throw some statistics at you then. The odds of contracting HIV from bottoming is less than one in a hundred. But odds from topping is almost one in a thousand. And that risk is cut by 60% by wearing a condom. Also though of course we have shit resources for testing so we can't be sure, with the meds you're on the odds are you're at an undetectable level, and there have been studies that suggest the risk then is practically zero."